A new computing method of gas compressibility factor

Compressibility factor is one of the important parameters of natural gas.Traditional computing method has big error in calculation of superhigh pressure natural gas.This paper matches the traditional compressibility factor with the experimental data of superhigh pressure gas compressibility factor,and obtains a formula of compressibility factor for both mid-low and high pressure conditions.The computation shows that the average error is 3.3% for low pressure interval and 2.5% for high pressure interval.Gas well pressure has been calculated by applying this formula,and high calculation accuracy has been achieved.